1231500 has 48 divisors (see below), whose sum is σ = 3590496. Its totient is φ = 328000.

The previous prime is 1231487. The next prime is 1231511. The reversal of 1231500 is 51321.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090 + ... + 1910.

It is an arithmetic number, because the mean of its divisors is an integer number (74802).

2^1231500 is an apocalyptic number.

1231500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1795248).

1231500 is an abundant number, since it is smaller than the sum of its proper divisors (2358996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231500 is a wasteful number, since it uses less digits than its factorization.

1231500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1231500 is about 1109.7296968181. The cubic root of 1231500 is about 107.1876637991.

Adding to 1231500 its reverse (51321), we get a palindrome (1282821).

The spelling of 1231500 in words is "one million, two hundred thirty-one thousand, five hundred".